Socket of pipe coupling



FIG. 1 is a perspective view of a socket of pipe coupling when seen from the top and right side of the back, showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a cross section taken across FIG. 5 along line VI—VI; and,

FIG. 7 is a cross section taken across FIG. 2 along line VII—VII.

A rear elevational view is omitted as it appears symmetrical with the front elevational view. A bottom plan view is omitted as it appears to be the same as the top plan view. 

The ornamental design for a socket of pipe coupling, as shown and described. 